OK.
I have an ION 3 with the ecotec 2.2 liter engine.
It has the cartridge old filter. I notice that there is enough room to put a magnet between the filter cartridge and the engine block.
If one puts a magnet there, the oil will come from the oil pump, past the magnet, through the filter and then to the engine.
It sure looks to me like this is an easy simple way to get just a little extra oil filtering.
I know that Saturn puts magnets in their transmission filters for their SL automatic transmissions, so I suspect that there's some benefit to doing it.
(I also know that the dealers often remove those same magnets when they change the transmission filters, so I suspect that there's not a whole lot of benefit to it [or maybe automatic transmission rebuilds are lucrative?]).
Love to know the thoughts of the folks on the group.